Fig. 1. Slit homogenizer structure

Fig. 2. Principle of slit homogenizer. (a) Spatial imaging; (b) spectral imaging

Fig. 3. Slit homogenization principle based on a purely geometrical concept. (a) Source at slit center; (b) source at arbitrary position

Fig. 4. Slit homogenization principle

Fig. 5. Fitting curve of light intensity distribution of slit homogenizer. (a) Input intensity; (b) exit intensity

Fig. 6. Intensity distribution at slit homogenizer exit. (a) I(y); (b) TracePro simulation

Fig. 7. ISRF at λ=500 nm

Fig. 8. ISRF with slit homogenizer/slit for heterogeneous calibration scene

Fig. 9. System principle diagram

Fig. 10. Physical image of slit homogenizer. (a) Slit homogenizer; (b) structural components included in the slit homogenizer

Fig. 11. ISRF curve

Fig. 12. Applied input Earth scenes corresponding to the slit illumination

Fig. 13. Applied input Earth scenes corresponding to the power in slit output. (a) 75%; (b) a-25%; (c) b-25%; (d) c-25%

Fig. 14. Power of slit output